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Anhydrous Amorphous Calcium Carbonate is Different from Transient Phase of Biogenic Amorphous Calcium Carbonate

Abstract

Amorphous calcium carbonate (ACC) is an important precursor phase of biogenic calcite. In this work, an in situ Ca L-edge X-ray absorption spectroscopic study has been carried out to monitor the phase transformation process of hydrated ACC from room temperature to 773 K in the presence of water vapor pressure at 0.4 mbar. The L2,3 crystal field splittings of the near edge X-ray absorption fine structure (NEXAFS) spectra acquired for hydrated and anhydrous ACC are indistinguishable. The transformation process from anhydrous ACC to calcite is greatly facilitated by the presence of water moisture. Our data acquired for nano-calcite are in close resemblance to those reported for "type 2" ACC in sea urchin laval spicule. We suggest that the "type 2 ACC" or the "transient phase of ACC" is a disordered calcium carbonate phase with nascent calcitic structure at the nanometer length scale.

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Publication details

The article was received on 21 Jan 2019, accepted on 15 May 2019 and first published on 15 May 2019


Article type: Communication
DOI: 10.1039/C9CC00518H
Chem. Commun., 2019, Accepted Manuscript

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    Anhydrous Amorphous Calcium Carbonate is Different from Transient Phase of Biogenic Amorphous Calcium Carbonate

    C. Tsao, P. Yu, C. Lo, C. Chang, C. Wang, Y. Yang and J. C. C. Chan, Chem. Commun., 2019, Accepted Manuscript , DOI: 10.1039/C9CC00518H

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